InFocus LP 850 Projector, yellow spot on screen

If you are looking at the projector with the lens facing you, look at the half moon shaped gray panel on the top and you will see a small **** that you can stick a flathead into. Slide the flathead away from the lens and the top should pop up. Then you will see the lamp. Unscrew the 3 or 4 screws on top of the lamp and pull it out using the wire handle on top of the lamp.

check the lens and also check that the lamp is coming on

POWER SUPPLY

upgrade the firmware for sure,also clean the filter on the lens side.

this could have more than one cause, but the most obvious is a burn-in on the lens or dust on the lamp. either way it has to be replaced by a professional.

the light tunnel has collapsed and needs to be replaced. unfortunately, infocus no longer makes or has parts for this model. you could try and find one on ebay. usually the power supply goes on those, so if someone has one with that problem you could get it and swap out the parts. good luck!

are the leds on the top lit or blinking? it could be the lamp, the ballast, or the fans. check the lamp. if there are black spots or bulges in the lamp, replace it. if not, make sure the fans are running. if they are, replace the ballast.

This would appear to be a componeent failing and I doubt if it is user fixable.
If it unser warranty send it back whence it came,
Further support try here
http://www.google.co.uk/url?q=http://www.infocus.com/support.aspx&sa=X&oi=smap&resnum=1&ct=result&cd=2&usg=AFQjCNFdFuwQfzBpULQpcHnzxmC_n12fdA

Hi there

I'm afraid this might be a faulty Mainboard.

Your lamp will never make the Projector show funny stuff on the image.

Must warn you that a new Mainbaord is quite expensive

ballast or lamp. if there are excessive hours on the lamp, that's the one.